| Assay Method Information | |
| | Fluorescence Polarization Assay |
| Description: | Assays effective in monitoring the inhibition of the MLL binding to menin were developed during experiments performed during the development of embodiments of the present invention. A fluorescein-labeled 12-amino acid peptide derived from MLL containing the high affinity menin binding motif was produced (Yokoyama et al., Cell., 2005. 123(2): p. 207-18., herein incorporated by reference in its entirety). Upon binding of the peptide (1.7 kDa) to the much larger menin (-67 kDa), the rotational correlation time of the fluorophore (peptide labeled with fluorescein at N-terminus) changes significantly, resulting in a substantial increase in the measured fluorescence polarization and fluorescence anisotropy (excitation at 500 nm, emission at 525 nm). The fluorescence polarization (FP) assay was utilized to determine the Kd for the binding of menin and the MLL peptide using a serial dilution of menin and 50 nM fluorescein-labeled MLL peptide. |
| Affinity data for this assay | |
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